Preparation of an isocyanate-free composite coating
Isocyanate-free composite coatings can improve radiative cooling, energy storage and harvesting applications. The new study reports the development and use of a isocyanate-free green surface coating(GSC) matrix derived from (2,2,6,6-tetramethylpiperidin-1-yl)oxy radical (TEMPO)-oxidised cellulose-(3-Aminopropyl)trimethoxysilane (APTMS)-ZnO nanoparticles-green polymer matrix that possesses upto ∼220 °C thermal stability.
The GSC exhibited excellent UV block and IR active capacity while achieving good coating hardness. The NMR, TGA-DTG and Pencil hardness studies revealed that this attribute by GSC was due to the formation of uniform crosslinking and reinforcement network. Using electrochemical impedance spectroscopy, the GSC had a low resistance. A high charge transfer resistance of ∼15.826 kΩ was measured using electrochemical impedance spectroscopy for the GSC, high enough to attenuate photon radiation, making GSC material stable for application.
Green material in energy applications
Also, UV-weathering study was performed to investigate coating stability of the GSC. As the scientists report, this is the first time application of TEMPO-cellulose based reinforcement of the green polymer matrix for the development of GSC through convergent approach to functional macromolecules.
The study opens an opportunity of utilising green material in energy applications, especially in windows shielding by a sufficient attenuation of photon radiations.
The study has been published in Progress in Organic Coatings, Volume 151, February 2021.